GREEN BUILDING: 3M joins U.S.-Chinese clean energy research project Published: Wednesday, February 5, 2014 3M Co. plans to participate in a U.S.-China research project to cultivate greener methods of heating and cooling buildings. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.